Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	6 Months Ended
	Dec. 31, 2019 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance at June 30, 2019	$ (6,579)
Other comprehensive income (loss) before reclassifications	(1,509)
Net current period other comprehensive income (loss)	(1,509)
Ending Balance at December 31, 2019	(8,088)
Pension and Postretirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance at June 30, 2019	(1,707)
Other comprehensive income (loss) before reclassifications	44
Effect of exchange rates on the pension plans	24
Net current period other comprehensive income (loss)	68
Ending Balance at December 31, 2019	(1,639)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance at June 30, 2019	496
Other comprehensive income (loss) before reclassifications	56
Effect of exchange rates on the pension plans	(24)
Net current period other comprehensive income (loss)	32
Ending Balance at December 31, 2019	528
Unrealized Loss on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance at June 30, 2019	(5,368)
Other comprehensive income (loss) before reclassifications	(1,609)
Net current period other comprehensive income (loss)	(1,609)
Ending Balance at December 31, 2019	$ (6,977)